Merge pull request #1682 from dataform-co/release-beta

Bump v3 to beta

Author: Elias Kassell

version.bzl

@@ -1,3 +1,3 @@
 # NOTE: If you change the format of this line, you must change the bash command
 # in /scripts/publish to extract the version string correctly.
-DF_VERSION = "3.0.0-alpha.5"
+DF_VERSION = "3.0.0-beta.0"